I need some advice from my fellow parents on how to approach my biological father and tell him that he is my biological father.

I was adopted, my biological mother was my father's half-sister and I've known that since I was a child. We haven't been sure who my biological father is, because of the sort of life that she lived, and unfortunately I never had the chance to ask her. Since I became a dad, I've felt this need to know who my own father was. Originally I never wanted to contact him, I just wanted to know who he was, so I spent the last year tracking down my mom's former acquaintances, reading her journals and looking at her photographs, trying to find him. After I found the man who was most likely my father, I tracked him down and since I'm a coward I didn't just knock on his door and tell him that I think that he's my dad, I went to his business and pretended to be a customer so that I could have a conversation with him, and see if we had similar voices, gestures etc. and surely enough we did. Then, I did something a little bit psychotic, I picked his water bottle out of the bin and paid a significant amount of money to a company that does DNA testing for paternity cases to test it to see if he's my father. They tested it and although they say that DNA taken in this way only has a 60% accuracy, according to the test he is my father.I want to approach him and tell him that he's my biological father, that he has a grandson, he lives very close to me and as far as I have ascertained he's divorced and has no children. However, I don't know how to go about this, especially since I have already had a conversation with him, and I got his DNA to test by going through his trash. What do I do? via /r/Parenting http://ift.tt/2EBhaOh